Lock



FIG. 1 is a front, top and right side perspective view of a lock showing our new design;

FIG. 2 is a front, bottom and right side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view of the lock in a use state.

The broken lines in the drawings illustrate portions of the lock or environmental subject matter which form no part of the claimed design. 

CLAIM The ornamental design for a lock, as shown and described. 